Computer Crime Prevention Act of 1984 - Amends the Federal criminal code to establish penalties for using or attempting to use certain computers with intent to defraud or obtain property by false pretenses. Limits the kinds of computers covered by this Act to those operating in interstate commerce or operating on behalf of the Federal Government or a financial institution, where the prohibited conduct directly affects the computer operation.

Makes it a separate offense to damage or destroy such a computer or to alter or delete any computer program or data stored in such a computer without authorization.

Establishes criminal penalties for any person who buys, procures, or sells the password or access code for a computer with the purpose to defraud or obtain money by false pretenses.

Sets forth a fine of not more than three times the amount of the gain derived from the offense or $50,000, whichever is higher, or imprisonment for not more than five years, or both.

Makes it a federal offense to use such computer without authorization.

Sets forth a fine for unauthorized use of not more than $5,000, or imprisonment for not more than one year, or both.